U.S. patent application number 15/217237 was filed with the patent office on 2018-01-25 for variable power take-off with electric generating capacity.
The applicant listed for this patent is Deere & Company. Invention is credited to Roger W. Burjes.
Application Number | 20180022337 15/217237 |
Document ID | / |
Family ID | 60889960 |
Filed Date | 2018-01-25 |
United States Patent
Application |
20180022337 |
Kind Code |
A1 |
Burjes; Roger W. |
January 25, 2018 |
VARIABLE POWER TAKE-OFF WITH ELECTRIC GENERATING CAPACITY
Abstract
A power take-off system and method is provided for a vehicle
that includes an internal combustion engine, an electrical
generator, an electrical machine, a power take-off summing
planetary and a power take-off brake. The power take-off system
includes a controller and a human-machine interface. The controller
is configured to receive an input from the human-machine interface
to select one of a variable speed power take-off mode, an
electrical power generation mode, and a full power fixed ratio
power take-off mode of operation. In the variable speed power
take-off mode, electrical power from the electrical generator and
rotational power by the power take-off system are output, and the
electrical machine receives electricity and provides rotational
power. In the electrical power generation mode, the electrical
generator and the electrical machine both provide electrical power.
In the full power fixed ratio mode, no electrical power is
provided.
Inventors: |
Burjes; Roger W.; (Cedar
Falls, IA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Deere & Company |
Moline |
IL |
US |
|
|
Family ID: |
60889960 |
Appl. No.: |
15/217237 |
Filed: |
July 22, 2016 |
Current U.S.
Class: |
477/4 |
Current CPC
Class: |
B60Y 2200/221 20130101;
B60W 30/1888 20130101; B60W 10/30 20130101; Y02T 10/62 20130101;
B60K 6/365 20130101; B60K 2025/024 20130101; B60W 2710/0677
20130101; B60W 10/08 20130101; B60Y 2300/43 20130101; Y10S 903/91
20130101; B60W 2710/086 20130101; B60W 50/14 20130101; B60K 17/28
20130101; B60Y 2300/78 20130101; B60W 10/06 20130101; B60W
2710/1038 20130101; B60W 20/10 20130101; Y10S 903/93 20130101; B60K
25/02 20130101; B60Y 2400/87 20130101; B60Y 2300/60 20130101; B60Y
2300/1888 20130101; B60Y 2400/73 20130101; B60W 10/196 20130101;
B60Y 2200/92 20130101 |
International
Class: |
B60W 20/10 20060101
B60W020/10; B60K 25/02 20060101 B60K025/02; B60W 10/08 20060101
B60W010/08; B60K 6/365 20060101 B60K006/365; B60W 10/196 20060101
B60W010/196; B60W 10/06 20060101 B60W010/06 |
Claims
1. A power take-off system for controlling a power take-off output
shaft of a vehicle having an internal combustion engine, an
electrical generator, and an electrical machine, the power take-off
system including a controller having a processor, a memory and a
human-machine interface, the controller configured to: receive an
input from the human-machine interface to select a variable speed
power take-off mode of operation or an electrical power generation
mode of operation for the power take-off system; in response to
selection of the variable speed power take-off mode, operate the
internal combustion engine to 1) drive the electrical generator to
provide electrical power to a high voltage bus and 2) provide
rotational power to the power take-off output shaft; and in
response to selection of the electrical power generation mode,
operate the internal combustion engine to 1) drive the electrical
generator to provide power to a high voltage bus, and 2) provide
rotational power to the electrical machine such that the electrical
machine provides electrical power to the high voltage bus.
2. The power take-off system according to claim 1, including a
power take-off speed sensor for sensing the rotational speed of the
power take-off output shaft and a power take-off brake for
controlling the power take-off output shaft, wherein the controller
is configured to adjust the rotational speed of the power take-off
output shaft by controlling at least one from the group consisting
of rotational power that is output from the internal combustion
engine and electrical power provided to the electrical machine.
3. The power take-off system according to claim 1, wherein, in
response to selection of the variable speed power take-off mode,
the controller is configured to selectively permit electrical power
to the electrical machine to provide rotational power to the power
take-off output shaft.
4. The power take-off system according to claim 1, wherein the
controller is configured to receive an input corresponding to a
full power fixed ratio mode of operation, wherein the controller is
further configured to 1) operate the power take-off system such
that electricity is not generated by either of the electrical
generator or the electrical machine and 2) control the internal
combustion engine to drive the output shaft at a full power fixed
ratio.
5. The power take-off system according to claim 4, wherein a power
take-off speed sensor is configured to sense rotational speed of
the power take-off output shaft and provide the rotational speed to
the controller, and wherein the controller is configured to control
a brake such that the electrical machine does not generate
electrical power during the full power fixed ratio mode.
6. The power take-off system according to claim 1, further
comprising a power take-off summing planetary gear train connecting
the internal combustion engine to the power take-off output
shaft.
7. A controller for a power take-off system of a vehicle having an
internal combustion engine, the controller configured to: receive
an input from a human-machine interface to select a variable speed
power take-off mode of operation or an electrical power generation
mode of operation for the power take-off system; in response to
selection of the variable speed power take-off mode, operate to 1)
drive an electrical generator using rotational power from the
internal combustion engine to provide electrical power to a high
voltage bus and 2) provide rotational power to the power take-off
output shaft; and in response to selection of the electrical power
generation mode, operate to 1) drive the electrical generator using
rotational power from the internal combustion engine to provide
electrical power to a high voltage bus, 2) drive an electrical
machine using rotational power from the internal combustion engine
to provide electrical power to the high voltage bus, and 3) actuate
a power take-off brake to stop rotation of the power take-off
output shaft.
8. The controller according to claim 7, including a power take-off
speed sensor for sensing the rotational speed of the power take-off
output shaft, wherein the controller is configured to adjust the
rotational speed of the power take-off output shaft during the
variable speed power take-off mode by controlling the internal
combustion engine and controlling the electrical power provided to
the electrical machine, which provides rotational power to the
power take-off output shaft.
9. The controller according to claim 7, wherein, in response to
selection of the variable speed power take-off mode, the controller
is configured to selectively permit power to the electrical machine
to provide rotational power to the power take-off output shaft.
10. The controller according to claim 7, wherein the controller is
configured to receive an input corresponding to a full power fixed
ratio mode of operation and in response operate to control the
internal combustion engine to drive the power take-off output shaft
at a full power fixed ratio.
11. The controller according to claim 10, wherein a power take-off
speed sensor is configured to sense rotational speed of the power
take-off output shaft and provide the rotational speed to the
controller, and wherein the controller is configured to control a
brake such that the electrical machine does not generate electric
power.
12. The controller according to claim 7, wherein the controller is
configured to selectively change the rotational speed of the power
take-off output shaft in response to an input from the
human-machine interface in the variable speed power take-off
mode.
13. A power take-off system for a vehicle having an internal
combustion engine, the power take-off system comprising: a gear
connected to an engine output shaft of the internal combustion
engine; an electrical generator in communication with the engine
output shaft for receiving power therefrom; an electrical machine
in communication with the engine output shaft; a power take-off
planetary gear train in communication with the engine output shaft;
a power take-off output shaft in communication with the power
take-off planetary gear train and configured to be driven by the
engine output shaft; a power take-off brake in communication with
the power take-off output shaft; and a power take-off control
system including a controller having a processor, a memory and a
human-machine interface, the controller configured to: receive an
input from the human-machine interface to select a variable speed
power take-off mode of operation or an electrical power generation
mode of operation for the power take-off system, in response to
selection of the variable speed power take-off mode, operate to 1)
drive the electrical generator using rotational power from the
internal combustion engine to provide electrical power to a high
voltage bus and 2) provide rotational power via the power take-off
planetary gear train to the power take-off output shaft, and in
response to selection of the electrical power generation mode,
operate to 1) drive the electrical generator using rotational power
from the internal combustion engine to provide electrical power to
a high voltage bus, 2) drive the electrical machine using
rotational power from the internal combustion engine to provide
electrical power to the high voltage bus, and 3) actuate a power
take-off brake to stop rotation of the power take-off output
shaft.
14. The system according to claim 13, including a power take-off
speed sensor for sensing the rotational speed of the power take-off
output shaft, wherein the controller is configured to adjust the
rotational speed of the power take-off output shaft by controlling
at least one from the group consisting of the rotational power that
is output from the internal combustion engine and electrical power
provided to the electrical machine in the variable speed power
take-off mode, and wherein the electrical machine is configured to
drive the power take-off output shaft.
15. The system according to claim 13, wherein in the variable speed
power take-off mode, the controller is configured to selectively
permit electrical power to the electrical machine to provide
rotational power to the power take-off output shaft.
16. The system according to claim 13, wherein the controller is
configured to receive an input corresponding to a full power fixed
ratio mode of operation, and wherein the controller is configured
to control the internal combustion engine to drive the power
take-off output shaft at a fixed ratio.
17. The system according to claim 16, including a power take-off
speed sensor for sensing rotational speed of the power take-off
output shaft and providing the rotational speed to the controller,
and wherein the controller is configured to control a brake such
that the electrical machine does not generate electrical power when
the power take-off output shaft is driven at the fixed ratio.
18. The system according to claim 13, wherein the controller is
configured to selectively change the rotational speed of the power
take-off output shaft in response to an input from the
human-machine interface in the variable speed power take-off mode.
Description
BACKGROUND
[0001] The present disclosure relates to a tractor having a power
takeoff and a method of controlling the power take-off and
generating electricity.
SUMMARY
[0002] In one embodiment, the disclosure provides a power take-off
system for controlling a power take-off output shaft of a vehicle
having an internal combustion engine, an electrical generator, and
an electrical machine. The power take-off system includes a
controller having a processor, a memory and includes a
human-machine interface. The controller is configured to receive an
input from the human-machine interface to select a variable speed
power take-off mode of operation or an electrical power generation
mode of operation for the power take-off system. In response to
selection of the variable speed power take-off mode, the controller
is configured to 1) drive the electrical generator to provide
electrical power to a high voltage bus and 2) provide rotational
power to the power take-off output shaft. In response to selection
of the electrical power generation mode, the controller is
configured to operate the internal combustion engine to 1) drive
the electrical generator to provide power to a high voltage bus,
and 2) provide rotational power to the electrical machine so that
the electrical machine provides electrical power to the high
voltage bus.
[0003] In another embodiment, the disclosure provides a controller
for a power take-off system of a vehicle configured to receive an
input from a human-machine interface to select a variable speed
power take-off mode of operation or an electrical power generation
mode of operation for the power take-off system. In response to
selection of the variable speed power take-off mode, the controller
is configured to operate to 1) drive an electrical generator using
rotational power from the internal combustion engine to provide
electrical power to a high voltage bus and 2) provide rotational
power to the power take-off output shaft. In response to selection
of the electrical power generation mode, the controller is
configured to operate to 1) drive the electrical generator using
rotational power from the internal combustion engine to provide
electrical power to a high voltage bus, 2) drive an electrical
machine using rotational power from the internal combustion engine
to provide electrical power to the high voltage bus, and 3) actuate
a power take-off brake to stop rotation of the power take-off
output shaft.
[0004] In another embodiment the disclosure provides a power
take-off system for a vehicle having an internal combustion engine.
The power take-off system includes a gear connected to an engine
output shaft of the internal combustion engine, an electrical
generator in communication with the engine output shaft for
receiving power therefrom and an electrical machine in
communication with the engine output shaft. The power take-off
system further includes a power take-off planetary gear train in
communication with the engine output shaft, a power take-off output
shaft in communication with the power take-off planetary gear train
and configured to be driven by the engine output shaft, a power
take-off brake in communication with the power take-off output
shaft, and a power take-off control system including a controller
having a processor, a memory and a human-machine interface. The
controller is configured to receive an input from the human-machine
interface to select a variable speed power take-off mode of
operation or an electrical power generation mode of operation for
the power take-off system. In response to selection of the variable
speed power take-off mode, the controller is configured to operate
to 1) drive the electrical generator using rotational power from
the internal combustion engine to provide electrical power to a
high voltage bus and 2) provide rotational power via the power
take-off planetary gear train to the power take-off output shaft.
In response to selection of the electrical power generation mode,
the controller is configured to operate to 1) drive the electrical
generator using rotational power from the internal combustion
engine to provide electrical power to a high voltage bus and 2)
drive the electrical machine using rotational power from the
internal combustion engine to provide electrical power to the high
voltage bus, and 3) actuate a power take-off brake to stop rotation
of the power take-off output shaft.
[0005] Other aspects of the disclosure will become apparent by
consideration of the detailed description and accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] FIG. 1 illustrates a perspective view of a tractor.
[0007] FIG. 2 is a schematic of a power take-off system of the
tractor shown in FIG. 1.
[0008] FIG. 3 is a flow chart for operation of the power take-off
system shown in FIG. 2.
[0009] FIG. 4 is a schematic of a power take-off system having
three modes of operation.
DETAILED DESCRIPTION
[0010] Before any embodiments of the disclosure are explained in
detail, it is to be understood that the disclosure is not limited
in its application to the details of construction and the
arrangement of components set forth in the following description or
illustrated in the following drawings. The disclosure is capable of
supporting other embodiments and of being practiced or of being
carried out in various ways.
[0011] FIG. 1 illustrates a tractor 20 having a power take-off
(PTO) 24 that includes a power take-off (PTO) output shaft 28. The
tractor 20 includes front wheels 30, rear wheels 32 and a cabin 36
for a user. The tractor 20 includes a hood bonnet 40 for enclosing
an internal combustion engine.
[0012] FIG. 2 illustrates a power take-off system 100 that includes
an internal combustion engine 104 for driving an engine shaft 108
and gear 112. The gear 112 is in communication with a gear 116 and
a generator shaft 120 of an electrical generator 124 (MG1). The
engine shaft 108 also connects to a power take-off (PTO) summing
planetary gear train 128. The power take-off summing planetary gear
train 128 is in communication with a gear 132 and a shaft 136 of an
electrical machine 140 (MG3). The power take-off summing planetary
gear train 128 includes an output shaft 144 that joins with a gear
148. The gear 148 is in communication with a power take-off output
gear 156 joined with a power take-off output shaft 160. The power
take-off output shaft 160 is selectively connected to a load 164,
such as an input for a seeding device or other tool device that is
separately hitched or connected to the tractor 20. Further, a power
take-off brake 162 is provided to stop rotation or otherwise
control the output shaft 144 that ultimately drives the power
take-off output shaft 160.
[0013] The power take-off system 100 shown in FIG. 2 also includes
a power take-off control system 166 that includes a controller 170
having a processor 172 and a memory 174. The processor 172 can be a
microprocessor, an application specific integrated circuit (ASIC),
a digital processor, or the like. The memory 174 can be a
non-transitory, computer-readable memory, such as a random access
memory (RAM) or a read only memory (ROM) that includes instructions
for execution by the processor 172.
[0014] The controller 170 is configured to selectively control the
power take-off system, including the power take-off brake 162. The
power take-off control system 166 includes a power take-off speed
sensor 176 for sensing rotational speed of the power take-off
output shaft 160. The power take-off speed sensor 176 provides a
rotational speed signal to the controller 170. Further, a
human-machine interface 180 is in two-way communication with the
controller 170 to provide user inputs to the power take-off control
system 166 and to display the status and various operating
parameters of the power take-off control system.
[0015] FIG. 2 further illustrates the controller 170 in
communication with a first MG1 controller 184 that controls the
electrical generator 124. The controller 170 is also in
communication with a second MG3 controller 186 that controls the
electrical machine 140.
[0016] A first power line 188 provides electrical power from the
electrical generator 124 to a high voltage bus 190. A second power
line 192 carries electrical power between the electrical machine
140 and the high voltage bus 190. The high voltage bus 190 provides
on board power 196 to various devices on the tractor 20. The high
voltage bus 190 also selectively provides off board power 198 to
other devices, such as a seeding device or other tool device
physically connected to the tractor 20.
[0017] Operation
[0018] A user provides inputs to the human-machine interface 180 to
operate the power take-off system 100. More specifically, the user
selects either a first mode that is a variable speed power take-off
mode of operation or a second mode that is an electrical power
generation mode of operation. Specifically, the power take-off
system 100 provides rotational power at a rotational speed selected
by a user along with some electrical generation in the variable
speed power take-off mode and alternatively provides significant
electrical generation without rotational power in the electrical
power generation mode.
[0019] In response to selection of the variable speed power
take-off mode by a user interacting with the human-machine
interface 180, the human-machine interface 180 provides an output
signal or value that the controller 170 receives as an input. The
controller 170 controls the internal combustion engine 104 to
provide rotational power via the engine shaft 108. The internal
combustion engine 104 communicates via gears 112, 116 with the
electrical generator 124 to generate electrical power or energy.
The electrical energy or electricity is provided via the first
power line 188 to the high voltage bus 190. Further, the controller
186 controls the electrical machine 140
[0020] Specifically, and with further reference to flowchart 200 of
FIG. 3, a user provides inputs to the human-machine interface 180,
selecting the variable speed power take-off mode, which includes a
power take-off speed value at step 204. In response to this input,
the controller 170 at step 208 changes (i.e., increases or
decreases) the rotational speed of the power take-off output shaft
by outputting a signal to control at least one of the internal
combustion engine 104 and the electricity provided to the
electrical machine 140 to drive the gear 132. The output signal is
based on one or more of the inputs provided to the human-machine
interface 180, the electrical power provided to the electrical
machine 140, and the measured rotational speed of the power
take-off speed sensor 176. The electrical generator 124
concurrently generates electricity that is provided to the high
voltage bus 190.
[0021] The routine advances to step 212, whereat the power take-off
speed sensor 176 measures the rotational speed of the power
take-off output shaft 160 and provides a measured power take-off
speed value to the controller 170. At step 216, the controller
compares the measured power take-off speed value with the input or
selected power take-off speed value.
[0022] If the measured power take-off speed value is greater than
the input power take-off speed value (step 220), the controller 170
provides at step 224 an output to adjust the rotational speed of
the power take-off output shaft 160 lower by returning to step 208
and operating to decrease the engine output value and/or decrease
current provided to the electrical machine 140 that provides power
to drive the power take-off output shaft 160.
[0023] If the measured power take-off speed value at step 220 is
not greater than the input power take-off speed value, the routine
advances to step 228.
[0024] At step 228, if the measured power take-off rotational speed
value is not less the input power take-off rotational speed value,
the speeds are considered the same and the routine returns to step
208. The controller 170 does not generate any additional or
different output for adjusting the rotational speed of the power
take-off output shaft 160. Thus, the power take-off rotational
speed is maintained.
[0025] At step 228, if the measured power take-off rotational speed
value is less than the input power take-off rotational speed value,
the routine advances to step 232. At step 232, the engine output
value is incremented higher and the routine returns to step 208 and
proceeds as previously described.
[0026] In the variable speed power take-off mode, the electrical
machine 140 is motoring. Thus, instead of acting as a generator,
the electrical machine 140 is receiving electricity from the high
voltage bus 190 and acting as a motor to power or drive the power
take-off summing planetary gear train 128.
[0027] The flow chart 200 is executed until the variable speed
power take-off mode is deselected or another mode is selected.
Besides the variable speed power take-off mode, a user may,
instead, select an electrical power generation mode with the
human-machine interface 180.
[0028] The power generation mode is described as follows. In
response to selection of the electrical power generation mode, the
human-machine interface 180 provides an output in the form of an
electrical power generation mode selection input signal for the
controller 170. In response, the controller 170 provides a brake
signal to the power take-off brake 162, which ceases rotation of
the output shaft 144. Thus, the power take-off output shaft 160 is
not rotating and accordingly, no mechanical off board power is
provided via the power take-off output shaft 160. Further, the
controller 170 controls the controller 184 and the controller 186
so that the electrical generator 124 receives power from the gear
116 and the electrical machine 140 receives power from the gear
132, and each operates to provide electricity to the high voltage
bus 190. Thus, the electrical power output for or from the tractor
20 is maximized due to the output of the electrical machine 140, in
addition to the electrical generator 124.
[0029] Power Take-Off System Having Three Modes of Operation
[0030] FIG. 4 illustrates another power take-off system 300 similar
to the system of FIG. 2. Like elements have the same reference
numeral except that the prefix is changed to "3" instead of "1".
Thus, description of the entirety of elements is not necessary.
Differences in the elements are as follows. As compared to the
power take-off summing planetary gear train 128 illustrated in FIG.
3, the motor shaft 308 of FIG. 4 directly drives a ring gear rather
than a sun gear of the gear train 328. Further, FIG. 4 illustrates
a brake 399 for use with the electrical machine 340. The power
take-off system 300 shown in FIG. 4 operates in a mode selected
from the group consisting of a first variable speed power take-off
mode, a second electrical power generation mode, and a third full
power fixed ratio mode.
[0031] In the first variable speed power take-off mode of
operation, the machine brake 399 is in an off position and the
controller 386 controls the electrical machine 340 to provide
motoring. Thus, in the first variable speed power take-off mode, a
user selects a rotational power take-off speed value for the power
take-off output shaft 360 and the power take-off control system 366
operates to obtain and maintain the rotational speed using the same
steps as shown in FIG. 3, discussed above and which need not be
repeated. The electrical generator 324 concurrently generates
electrical power that is supplied to the high voltage bus 390.
[0032] In the second electrical power generation mode of operation,
the brake 399 is in an off position or not actuated. The power
take-off brake 362 is actuated. The controller 384 controls the
electrical generator 324 and the controller 386 controls the
electrical machine 340 so both generate electrical power that is
provided to the high voltage bus 390. The high voltage bus 390
provides on board power 396 to the tractor 20, including to a
battery of the tractor. Further, the high voltage bus 390 may
selectively provide off board power 398 to a tool device or
implement physically and electrically connected to the tractor
20.
[0033] The third full power fixed ratio mode of operation occurs
when the controller 370 in FIG. 4 receives an input corresponding
to the fixed ratio mode from the human-machine interface 380. In
the full power fixed ratio mode of operation, rotational power
output by the power take-off output shaft 360 at a fixed ratio is
maximized. In the full power fixed ratio mode, the power take-off
brake 362 is off or not actuated to enable the output of rotational
power. Further, the controller 370 sets or actuates the brake 399
so that the electrical machine 340 is not generating electricity or
providing a load against the transfer of power from the internal
combustion engine 304 via the engine shaft 308, the power take-off
summing planetary gear train 328, the gear 348 and the power
take-off output gear 356 to the power take-off output shaft 360.
Moreover, the electrical generator 324 can be set in an off or
non-generating condition. As the electrical generator 324 and the
electrical machine 340 are not driven to generate electricity, the
transfer of rotational power from the internal combustion engine
304 to the power take-off output shaft 360 is maximized. The
rotational power is transferred from the power take-off system 300
to a load 364 of a tool device or implement that is connected to
the power take-off 24 of the tractor 20.
[0034] Alternative Arrangements
[0035] In one embodiment, the internal combustion engine 104 of the
tractor 20 is a gas powered engine. In another embodiment, the
internal combustion engine 104 is a diesel powered engine.
[0036] In another embodiment for the variable speed power take-off
mode, instead of the electrical machine providing additional power
to the power take-off, a brake (not shown) operates such that the
electrical machine 140 does not provide a load to the internal
combustion engine 104 or generate electrical power.
[0037] In some embodiments, the power take-off speed sensor 176
senses rotation of the output shaft 144 electromagnetically or
optically. In other embodiments, the power take-off speed sensor
176 directly senses rotational speed of the power take-off output
shaft 160 electromagnetically or optically.
[0038] In one embodiment, the controller 170 is a chassis
controller. In another embodiment, the controller 184 is integrated
within the electrical generator 124 and the controller 186 is
integrated within the machine 140. In one embodiment, the
controller 184 and the controller 186 are combined with, or a part
of, the controller 170.
[0039] In one embodiment, the load 164 is part of an exact-emerge
planter. The electrical power generation mode is used to provide
off board power 198 to electric blower motors of air seeders.
[0040] While a tractor 20 is illustrated, the power take-off 24 can
be provided for other types of vehicles or machines. The power
take-off 24 shown at the front of the tractor 20 in FIG. 1 also can
be located at the rear of the tractor or a vehicle.
[0041] Thus, the disclosure provides, among other things, a power
take-off system having multiple operating modes, including an
electrical power generation mode and a maximum rotational power
mode. Various features and advantages of the disclosure are set
forth in the following claims.
* * * * *